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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8686c5b15d39b59ecec196a07011d4fa29b791b787d2bcd6a973d0cdc8a66221' 
  AND token = 'hLXT3Ect5k+MvqymDE2lIludmLq1QOZa3YYDJA6umGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}